The 83-year-old porn moghul admits he is happier than ever with 23-year-old girlfriend Crystal Harris and hasn't ruled out making their union official, reports gossipblender.com.

When asked about whether he would consider marriage, he said: "It's certainly possible. I certainly care enough for her. I certainly love her enough. We'll see. All I want is for the relationship to be as happy as it is. I'm having more fun than I did when I was 20."

Rumours are rife that the media mogul, who has been married three times, has had change of heart as he previously vowed never to tie the knot again.

"I haven't had a lot of luck with marriage. I don't have a good track record and I don't want to screw this one up," he had said.

Hefner first started dating Harris a year-and-a-half ago, while he was still in a relationship with 20-year-old twins Kristina and Karissa Shannon.

In January, he confirmed his romance with Harris was "getting more serious" and asked his other lovers to move out of the Playboy Mansion into the neighbouring Playmate House.